Abstract
This paper presents a novel time domain approach for Structural Health Monitoring (SHM) systems based on Electromechanical Impedance (EMI) principle and Principal Component Coefficients (PCC), also known as loadings. Differently of typical applications of EMI applied to SHM, which are based on computing the Frequency Response Function (FRF), in this work the procedure is based on the EMI principle but all analysis is conducted directly in time-domain. For this, the PCC are computed from the time response of PZT (Lead Zirconate Titanate) transducers bonded to the monitored structure, which act as actuator and sensor at the same time. The procedure is carried out exciting the PZT transducers using a wide band chirp signal and getting their time responses. The PCC are obtained in both healthy and damaged conditions and used to compute statistics indexes. Tests were carried out on an aircraft aluminum plate and the results have demonstrated the effectiveness of the proposed method making it an excellent approach for SHM applications. Finally, the results using EMI signals in both frequency and time responses are obtained and compared.
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Acknowledgements
The authors would like to thank Capes Foundation, Ministry of Education of Brazil (DINTER 23038.034330/2008-32), FAPESP (grant 2011/20354-6), CNPq and FAPEMIG (through the INCT-EIE).
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© 2014 The Society for Experimental Mechanics
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de Oliveira, M.A., Filho, J.V., Jr., V.L., Inman, D.J. (2014). Damage Detection Based on Electromechanical Impedance Principle and Principal Components. In: Allemang, R., De Clerck, J., Niezrecki, C., Wicks, A. (eds) Topics in Modal Analysis, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-6585-0_28
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DOI: https://doi.org/10.1007/978-1-4614-6585-0_28
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